Locomotion of Colloidal Particles

Dear Colleagues,

The area of Locomotion of Colloidal Particles has continued to receive much attention from researchers in the fields of chemical, mechanical, biomedical, and environmental engineering and science. The majority of this locomotion is fundamental in nature, but permits one to develop a rational understanding of many practical systems and industrial processes, such as centrifugation, agglomeration, flotation, spray drying, motion of cells in blood vessels, microfluidics, and aerosol technology. Conventional driving forces for the motion of hard, soft (polymer-adsorbed), and fluid particles include concentration gradients of the particles themselves (diffusion or Brownian motion), bulk velocities of the disperse media (convection), and gravitational or centrifugal fields (sedimentation). Another category of driving forces for the motion of colloidal particles involves a non-uniform imposed field (such as temperature, solute concentration, or electric potential) that interacts with the interfacial region at the surface of each particle. These phenomena include electrophoresis of charged particles in electrolyte solutions, diffusiophoresis of charged or uncharged particles, thermocapillary motion of liquid droplets or gas bubbles, thermophoresis and photophoresis of aerosol particles, and osmophoresis of semi-permeable vesicles. These phenomena find application in particle characterization, sensing, manipulation, assembly, separation, and transport in various physicochemical and biomedical systems. For this Special Issue, we seek fundamental and applied research contributions concerning the mobilities, mechanisms, dynamic behaviors, particle interactions (concentration effects), boundary effects, and other characteristics in the locomotion of colloidal particles.

Prof. Huan J. Keh
Guest Editor

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